That is because Scotland has all but exited the traditional low-end business that McIntyre calls raspberry "pulp"--small Clova berries that could be sloppily picked by the bucketful, frozen, then sold to jam producers or clothing dyers.
They build a paper nest by chewing small amounts of wood from trees, reeds or garden fences and mix it with saliva to form a pulp which is added to the nest in thin strips.